Telephone-mouthpiece.



. W. GIBSON.

TELEPHONE MOUTHPIEGE. Y

AIPLIOATION FILED APB.-20,1908.

913,947. I Patented Mar. 2, 1909;

4 4 041M 7 I v I T all wlzom it may concern.

I the mouth-piece from glass or vitreous ma- F The advantages 0 the use of glass-in teleing the surface of the material from which it UNITED STATES PATENT OFFICE.

WILLIAM GIBSON, OF DANBURY, CONNECTICUT, ASSIGNOR TO THE GIBSON MFG. 00. OF

DANBURY, CONNECTICUT, A CORPORATION,

TELEPHONE-MOUTHPIECE.

. Specification of Letters Patent.

- Patented March 2, i909.

' Application filed April 20, 1908. Serial No. 428,228.

Be itknown that I,W'1LLIA1-[ GIBSON, a l citizen of the United States, residing'at Dani bury, in the county of Fairfi'eld and State of i Connecticut, have invented a new and useful Improvement in Telephone-Mouthpieces; 1 and I do hereby declare the following, when taken in connection with the accompanying drawings and the numerals of, reference marked thereon, to be a full, clear, and-exact description of'the same, and which said drawings constitute part of, this specification, and represent, in v Figure 1 a sectional view of a mouth-piece constructed in accordance with my invention, showing the metal shell in side elevation. Fig. 2 a sectional view of the shell, detached. Fig. 3 a plan view of the shell.

This invention relates to an improvement in telephonemouthieces.

phone parts is too well recognized to need setting forth here, but as a mouth-piece, glass has not only the advantages of being a erfect non-conductor, but can without d i 'culty be readily cleansed without injuris formed. A further advantage of forming terial is that it may be readily enameled or otherwise coloredto correspond with the furnishings of theroom in which it is placed; but difficulty is found in forming a glass mouth-piece with threads by which it may be engaged with the telephone, and the object of this invention is to form the mouthpiece from glass or vitreous material and mount a metal cup or shell at the inner end thereof by which it may be connected with a telephone; and the invention consists in. the construction hereinafter described and pointed out in the claim.

In carrying out myinvention I form'the mouth-piece 2 which is' of usual shape, from glass or vitreous material and by the term glass as hereinafter used, I wish to be understood as including any equivalent vitreous material. To provide meansfor securing -the mouth-piece in place I form the cup or shell 3 ,from metal with external threads 4' corresponding to 'thethreads usually formed at the inner end of the mouth-piece. These threads 4 form a shoulder 5 which is seated againstthe inner edge of the mouth-piece into which the cup projects, the bottom of the cup having per telephone mouth-pieces. The inner walls of this mouth-piece are slightly tapere d,- and when the shell 3 is inserted into the inner end the bottom of the cup or'shell is expandedwithin the mouth-piece so as to interlock it therewith, or to prevent its withdrawal, the

shoulders forming a stop to limit the inward movement ofthe shell.

In forming this mouth-piece fromglas's' or other vitreous material they are not perfectly round, and expanding the, shell within the mouth-piece the shell conforms to the irregularities of the surface of the mouth-piece and is therefore interlocked therewith against rotation. The shell is therefore firmly and permanently interlocked with the mouthpiece.

I claim:

A telephone mouth-piece formed from glass, combined with a cu -like shell inserted into the inner end thereof said shell formed with external .threads and the inner end of the shell expanded within the-mouth-piece,

substantially as described.

In testimony whereof, I-have'signed this specification in the presence of two sub scribing witnesses.

WILLIAM GIBSON.

V Witnesses: I EUGENE M. BULKLEY, INA B. SEYMOUR.

55 orations 6 as usual 1n 

